Continuity mistake: After the part where Merle and Daryl save the people on The Bridge, Merle gets agitated at Daryl and grabs him and rips his shirt. On the left side of Daryl's back, he has tattoos on his right side, but as he walks away he suddenly has the tattoos on his left side. (00:25:50)
Continuity mistake: When helping the foreign family to fight off the walkers, Daryl pulls the zombie back into the car and slams its head in the boot door, covering his hands in blood in the process. However, for the rest of the scenes in the episode and in shots directly afterwards, his hands appear totally clean without him doing anything to clean them. (00:22:00)
Continuity mistake: When the Governor first attacks the prison, he is standing on the driver's side but in front of the truck. Next, Michonne aims at the truck and now the black guy who was always with Martinez is shot dead on the driver's side. Then after that, you see he's alive again on the passenger side right before the other truck comes crashing through the gates with all the walkers inside.
Suggested correction: The man you're taking about is Shumpert aka "Bowman." He's was not shot dead. He dove for cover and is still alive. In fact, he's in at least a half dozen more episodes, including in season 4.